This is awesome. It's almost a nixter or boysetsfire with a decidedly Germaine touch to it. The independence of the young one walking boldly and with determination well in front of the adult is what strikes me.
Good capture in a very candid way for a shot of children at this age. It looked like a water fun shot in the thumb. I like the expression of the smaller one, like he is thinking about something far ahead.
I swear I can just look at motion blur ALL DAY LONG. This has the added element of nice contrast and interesting subject matter. Great use of negative space.